How does a fashion desigher breathe life into a lipstick or a signature scent? From Shakespeare to iconic handbags, they reveal their beauty muses for fall.

YSL

YSL

"I dreamed of a hothouse garden — a little venomous, like the deep hues of Guido Mocafico's iconic snake photographs," says YSL's new makeup master, Lloyd Simmonds, citing the decadent spirit (and palette) of the brand in the '70s as further inspiration. Color, in the hands of Simmonds, is loud and proud via seriously smoldering violet and teal eyeshadows, saturated plum lipsticks, and cobalt nail lacquers. But for minimalists looking to go a tad less Studio 54, worry not. "Take one bold shade from the collection and use it as an accessory," he advises. "The rest of your face can be completely natural."